# How Long Does a Sewer Line Last? Material by Material | Angeleno Sewer Line Repair > How long does a sewer line last? What limits the life of clay, cast iron, Orangeburg, PVC and lined laterals, and why age is a reason to inspect, not a verdict. URL: https://lasewerlinerepair.com/guide/how-long-does-a-sewer-line-last/ Learn ## How Long Does a Sewer Line Last? There is no honest single number. There are failure mechanisms, and each material has its own. Here is what limits each one. By Angeleno Sewer Line Repair · Updated October 20, 2026 How long a sewer line lasts depends far more on how it fails than on how old it is. Clay barrels resist corrosion but their joints admit roots, cast iron corrodes from the inside, Orangeburg deforms, and plastic pipe lasts as long as its bedding and joints hold. Age is a reason to inspect a lateral, not proof it has failed. Lifespan charts with a neat number for each material circulate widely, but most do not cite where the numbers came from, and they cannot account for your soil, your trees, how the pipe was laid or what has gone down it. [Angeleno Sewer Line Repair](/) would rather explain what limits each material and let a camera inspection tell you where your line stands. Where we give a figure in this guide, it comes from a named public source. ### Why a single number is misleading Two laterals of the same material, laid in the same year on the same street, can be in very different condition. One has a parkway ficus whose roots found an open joint; the other does not. One was laid on firm, compacted bedding; the other on loose fill that settled into a belly. One served a household that poured grease down the sink for decades. The City of Los Angeles has moved away from age as the deciding factor too. The Bureau of Engineering’s S-Permit processing procedures, revised in May 2026, state that the age of the house connection lateral will no longer be the main reason for deciding whether a CCTV inspection is required. What the City grades is condition on video, from Excellent through Fair and Poor to Very Poor. ### Material by material Material Where it shows up What usually limits its life Vitrified clay Older laterals, often from the street to near the house; City mains are typically clay too Joints: roots, separation and offsets as the ground moves. The barrel itself resists corrosion well. Cast iron Building drain under the house, sometimes the first stretch of lateral Internal corrosion and scale, a channel worn along the bottom, failure at the transition to clay Concrete or cement pipe Some older laterals Surface erosion and cracking. The City treats it as non-standard with stricter requirements. Orangeburg (bituminous fiber) Not documented as common in Los Angeles Deformation and blistering as it ages ABS and PVC plastic Most replacement laterals today Bedding, slope, joint quality, crushing by loads or other construction HDPE Pipe bursting replacements Fused joints and alignment; follows the old pipe’s path CIPP liner Lining inside an existing pipe Installation and curing quality, the host pipe’s shape, connections at each end #### Vitrified clay Clay pipe is fired ceramic, laid in short sections joined end to end. The barrel is hard and resists the chemical attack that eats metal and concrete, which is why very old clay can still be structurally sound between joints. The weak points are the joints. Older clay joints were not designed to keep roots out or to flex when the ground moves. Roots find the moisture leaking from a slightly open joint, grow in, and thicken into a mat. Settlement or an earthquake shifts one section relative to the next, creating an offset. So the useful question for a clay lateral is not “how old” but “how many joints are open, and where.” A clay line with sound, tight joints may keep working. One with roots at many joints along its length is a candidate for [clay sewer pipe replacement](/clay-sewer-pipe-replacement/) or lining. #### Cast iron Cast iron is strong and was the standard material for drains under houses for decades. It fails from the inside: corrosion builds scale that narrows the pipe and catches debris, and the bottom of the pipe, where water always runs, can wear into a channel and eventually open. The transition where cast iron outside the foundation meets clay is a frequent trouble spot. See [cast iron sewer line replacement](/cast-iron-sewer-line-replacement/) for how a deteriorated cast iron run is assessed. #### Concrete and cement pipe Concrete and cement pipe turns up in some older laterals. The Bureau of Engineering treats cement pipe as non-standard: under its general conditions, a Poor rating on camera makes repair required for cement pipe, where for other materials Poor makes repair recommended. #### Orangeburg Orangeburg is a bituminous fiber pipe made from wood pulp and pitch, used in parts of the country through the mid-twentieth century. It softens, blisters and deforms over time. It is a well-known problem in some regions. We have not found evidence that Orangeburg was widely used in Los Angeles laterals, so do not assume your line is Orangeburg without seeing it on camera. If it is, its tendency to lose shape matters for the repair choice, because a pipe that has deformed may not be suitable for lining. #### ABS and PVC Plastic pipe does not corrode and its joints are far tighter than old clay joints, so roots have a much harder time getting in. What limits a plastic lateral is mostly installation: whether it was bedded properly, laid at a consistent slope, and protected from loads. Poorly compacted backfill can let a plastic line sag into a belly, and a pipe crushed by a later excavation or a heavy vehicle over shallow cover fails regardless of material. #### HDPE High-density polyethylene is the usual pipe pulled in behind a bursting head. Its joints are heat-fused into a continuous pipe, which removes the joints roots exploit. Because bursting follows the old pipe’s path, an HDPE replacement inherits the old alignment, including a sag that was there before. #### CIPP liners A cured-in-place liner forms a new pipe inside the old one. Liner thickness is calculated from an assumed design life and the loads the liner must carry, and that design figure is an engineering assumption, not a promise of how long a specific installation lasts. The real-world variables are installation quality, how well the resin cured, the condition and shape of the host pipe, and how the ends are sealed. NASSCO, the trade association for pipeline rehabilitation, publishes guidance on rehabilitation methods and their limits. A liner does not correct a belly, and it cannot go into a pipe that has collapsed. More in [sewer pipe lining](/sewer-pipe-lining/). ### What shortens a lateral’s life These factors matter more than the year the pipe was laid: - **Trees.** Roots are the most common reason a lateral gets cleared, and LA Sanitation attributes more than half of sewer backups to roots and grease combined. - **Ground movement.** Settlement, poorly compacted fill and earthquakes separate rigid joints. - **Bedding and slope.** A line laid without consistent support develops a belly. - **What goes down the drain.** Grease, wipes and food solids build up, especially where flow slows. - **Loads.** Vehicles over shallow pipe, heavy construction or other excavations. - **Previous repairs.** A patch of a different material, or a poorly made transition, is a common failure point. One factor that does not apply much in the Los Angeles basin is frost. NOAA’s 1991–2020 climate normals show essentially no days at or below freezing for downtown Los Angeles, so frost heave, a major cause of pipe damage in colder climates, is not a meaningful driver here. ### What extends it Keep roots in check, but understand that cutting them is maintenance, not a repair: roots return through the same open joint. Keep grease out. Keep a usable cleanout so the line can be cleared and filmed without pulling a toilet. And when one section fails, a [spot repair](/sewer-spot-repair/) of that section can be the right answer if the camera shows the rest of the line is sound. ### How to know how much life your line has left Film it. A camera inspection shows the material, the joints, roots, offsets, cracks, corrosion, standing water and any loss of shape, with the distance from the cleanout for each. That is the evidence a repair-or-wait decision should rest on. The [inspection report guide](/guide/how-to-read-a-sewer-inspection-report/) explains what the findings mean, and [repair vs replacement](/guide/sewer-line-repair-vs-replacement/) explains how to choose once you know. Good times to inspect are when buying a house, before paving over or building near the line, after a backup, and when roots have been cleared more than once. In the City of Los Angeles, LA Sanitation offers a rebate of up to $300 toward a camera inspection while annual funds last. Questions about your own line? Phones answered 24/7, every day. A camera inspection answers most of them. [Call (213) 782-3753](tel:+12137823753)[Get an Estimate](/contact/) ### Questions people ask #### Is a 70-year-old clay sewer line due for replacement? Not automatically. Vitrified clay barrels resist corrosion well, and many old clay laterals still carry flow. What usually fails is the joints, through roots and settlement. A camera inspection shows whether the joints are open, roots are entering or sections have shifted, which tells you far more than the pipe's age. #### How long does a CIPP liner last? Liners are designed to a service life as part of the engineering calculation for their thickness, and that design figure is an assumption, not a guarantee. How long a given liner actually performs depends on the host pipe, the installation and curing, and what goes down the drain. Treat any lifespan figure for a liner as a design assumption, not a record of how your line will perform. #### Does the City of Los Angeles use pipe age to decide if a lateral needs work? Not as the main factor. The Bureau of Engineering's current S-Permit procedures state that the age of the house connection lateral will no longer be the main reason for deciding whether a CCTV inspection is required. Condition on camera is what the City grades. ### Keep reading - [Signs of a Broken Sewer Line, and What Else They Could Mean](/guide/signs-of-a-broken-sewer-line/) - [What Is a Sewer Lateral? A Los Angeles Owner's Guide](/guide/sewer-lateral-los-angeles/) - [How to Read a Sewer Inspection Report](/guide/how-to-read-a-sewer-inspection-report/) - [Sewer Line Repair vs Replacement: How to Decide](/guide/sewer-line-repair-vs-replacement/) - [Pipe Bursting vs Pipe Lining: Which One Fits Your Sewer Line?](/guide/pipe-bursting-vs-pipe-lining/) - [Clay Sewer Pipe Replacement →](/clay-sewer-pipe-replacement/)